The BBC reports that supermarket sales of free-range chicken spiked last month after a promotion with TV celebrity chefs.
< http://www.bbc.co.uk/mediaselector/check/player/nol/newsid_7240000/newsid_7244200?redirect=7244211.stm&news=1&bbram=1&nbwm=1&nbram=1&bbwm=1&asb=1 >
a) Which determinant of demand has changed
b) Use a diagram to explain what has happened to the demand curve
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